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Revision Autor Zeilennr. Zeile
148 lars 1 
<?php
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namespace Faker\Calculator;
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/**
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 * Utility class for generating and validating Luhn numbers.
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 *
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 * Luhn algorithm is used to validate credit card numbers, IMEI numbers, and
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 * National Provider Identifier numbers.
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 *
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 * @see http://en.wikipedia.org/wiki/Luhn_algorithm
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 */
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class Luhn
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{
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    /**
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     * @param string $number
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     *
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     * @return int
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     */
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    private static function checksum($number)
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    {
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        $number = (string) $number;
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        $length = strlen($number);
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        $sum = 0;
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        for ($i = $length - 1; $i >= 0; $i -= 2) {
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            $sum += $number[$i];
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        }
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        for ($i = $length - 2; $i >= 0; $i -= 2) {
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            $sum += array_sum(str_split($number[$i] * 2));
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        }
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        return $sum % 10;
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    }
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    /**
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     * @param string $partialNumber
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     *
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     * @return string
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     */
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    public static function computeCheckDigit($partialNumber)
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    {
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        $checkDigit = self::checksum($partialNumber . '0');
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        if ($checkDigit === 0) {
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            return 0;
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        }
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        return (string) (10 - $checkDigit);
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    }
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    /**
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     * Checks whether a number (partial number + check digit) is Luhn compliant
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     *
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     * @param string $number
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     *
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     * @return bool
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     */
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    public static function isValid($number)
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    {
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        return self::checksum($number) === 0;
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    }
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    /**
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     * Generate a Luhn compliant number.
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     *
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     * @param string $partialValue
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     *
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     * @return string
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     */
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    public static function generateLuhnNumber($partialValue)
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    {
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        if (!preg_match('/^\d+$/', $partialValue)) {
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            throw new \InvalidArgumentException('Argument should be an integer.');
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        }
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        return $partialValue . Luhn::computeCheckDigit($partialValue);
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    }
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}